Orange, a French wireless carrier, plans to provide a service that will let Facebook users call friends without needing their phone numbers.

The new feature, called "Party Call," will launch this summer in France and will let friends call each other one-on-one or in a group, TechCrunch reported today.

Orange said the feature is the result of a partnership with Facebook. The mobile provider built the service using Facebook's open API, or application programming interface, for developers. The service uses Facebook's open social graph, letting users invite friends and post messages about each call to walls and Timelines.